Riverside Manufacturing provided the following information for the month ended March 31: Sales Revenue $15.000 Beginning Finished Goods Inventory 11,000 Ending Finished Goods Inventory 9,500 Cost of Goods Manufactured 19,800 Compute cost of goods sold. Select one: A. $18,100 B. $21,100 o C. $21,300 D. $19,600 E. None of the above